Tape feed alarm



y 6 o. M. ZORN 3,251,522

TAPE FEED ALARM Filed May 25, 1964 INVENTOR DUANE M. ZORN ATTORNEY FIG. 3

3,251,522 TAPE FEED ALARM I Duane M. Zorn, Mundelein, Ill., assignor to Teletype Corporation, Slrolrie, 111., a corporation of Delaware Filed May 25, 1964, Ser. No. 369,935 14 Claims. (Cl. 226-100) This invention relates to web handling devices and more particularly to a device for use in printing telegraph reperforators for detecting the failure of thetape feeding operation.

In the past there have been many attempts to provide a suitable mechanism for detecting the failure of tape feeding mechanisms in printing telegraph apparatus. These attempts have met with varying success and have not attained extensive use because of the fact that they comprise rather complicated mechanism, usually of the type wherein the tape feed driving mechanism operated a toothed feed roller, a second roller was driven by the tape and variations in the relative positions of these two wheels were detected mechanically to control rather complex electrical circuitry which would detect the lack of synchronism of the two wheels, that is, the feeding and the driven wheels.

It is an object of the present invention to provide a simple and reliable alarm device for tapefeeding apparatus.

Another object of the invention is to provide an apparatus for detecting the failure of a web feeding device properly to feed the web.

In accordance with one embodiment of the invention an apparatus is provided for attachment to a printing telegraph tape perforator which comprises a reciprocatable and oscillatable tape sensing pin for movement into the tape feed holes in a tape under spring pressure and out of said holes under power retractiomthe pin being reciprocated on each operation of the perforator and being arranged to be oscillated by the movement of the tape. Upon failure of the pin to be'oscillated by the feeding of the tape, its path of retraction will be the same as its path of movement into the tape feedholes and will cause a lever actuating arm to be operated positively to release a switch controlling lever for operating an alarm switch. The lever actuating arm is aligned 'With an'extension on the sensing pin so that it will be oscillated each time the sensing pin moves to sense the tape and will be reciprocated only when the sensing pin is not driven by the tape. The controlling lever and actuating arm cooperate in such a manner that when the actuating arm is operated to indicate a tape feeding failure, the switch actuating lever will hold the actuating arm and prevent its restoration to its normal position whereby an alarm device may be activated and held activated until the actuating arm is manually restored to operative condition.

A complete understanding of the invention may be ha by reference to the accompanying drawings wherein:

FIG. 1 is a fragmentary sectional view taken through a typing reperforator of the type shown in the Patent No. 2,951,902 issued to R. E. Arko et al., on September 6, 1960, and showing the tape feeding mechanism of said reperforator with the tape feed alarm device of the present invention mounted thereon;

FIG. 2 is an end elevational view taken substantially along the line 2-2 of FIG. 1 in the direction of the arrows;

FIG. 3 is a fragmentary sectional view taken substantially along the line 3--3 of FIG. 2 in the direction ofice the arrows, showing the feed sensing pin in its lowermost position preparatory to entering a feed hole perforation in the tape;

FIG. 4 is a fragmentary view similar to FIG. 2 but showing the switch controlling lever in the position to which it is moved by the sensing pin when a tape feed failure occurs; and

FIG. 5 is a fragmenttary diagrammatic view illustrating the path of movement of the upper end of the feed sensing In the drawings the alarm device is shown mounted on a typing reperforator of the type disclosed in the aforementioned Patent No. 2,951,902 to R. E. Arko et al., the disclosure of which is incorporated herein by reference as if completely described in detail, insofar as is necessary for a complete understanding of the utility and operation of the present invention. Those parts common to this disclosure and the Arko et al. patent have been designated with the reference numerals used in said patent and throughout the several views the same reference numerals designate similar parts. 7 The reperforator with which the present invention may be used includes a punch mechanism 26 into which a tape 10 may be fed by a tape feed roller 491. Power for driving the punch mechanism 26 and the cooperating detector mechanism 11 is derived from toggle mechanism 191 comprised of hell crank levers 192 fixed to an oscillatable shaft 193 and bell crank levers 194 pivoted on the levers 192. The bell crank lever 192 has an arm 497 on it to which a feed pawl 496 is pivoted. A spring 498 urges the feed pawl 496 into engagement with a ratchet 494 fixed to a shaft 492 that has the tape feed roller 491 fixed to it. Thus, each oscillation of the shaft 193 will cause the roller 491 to advance the tape 10 one step.

Tape 10 is advanced by the tape feed roller 491 over a guide plate 168 and under a die plate 167 both of which plates are fixed to a guide or punch block 170 The tape 10 is directed into association with the tape feed roller 491 by a tape guide 488 which feeds the tape 10 under a roller 489 provided with a series of holes I extending about its periphery for cooperation with perforating pins 490 that project from the tape feed roller 491. These pins 490 pierce the tape 10 to form feed holes in it. However, the feed holes in the tape may be prepunched in it or the punch mechanism 26 may perforate the feed holes after the feed roller 491 advances the tape 10 to the punch mechanism 26 and into a tape slot 171 located between the die plate 167 and the guide plate 168.

The punch mechanism 26 includes punches 34 slidably mounted in the guide plate 168 and in a lower guide plate 169 for cooperation with die slots 172 in the die plate 167. After the punches 34 have been moved upwardly to perforate a tape 10 they are retracted to the position shown in FIG. 1 by a stripper bail 177 that has arms 180 for pivotally supporting the bail on a pivot shaft 181 secured in horizontal projections 179 extending from the spacer block 170. The stripper bail 177 is urged to return to the position shown in FIG. 1 by a spring 184. which effects the retraction of the punches 34.

In the punching of tape, the punches 34 are selected for actuation by punch selector slides 156 upon the release of such slides by latches 153. There is one slide 156 and one latch 153 for each punch 34 and those punches 34, that are selected for actuation by their latches 153 releasing the associated punch selector slides 156, Will 3 be driven upwardly by their associated slides 156. Any punch selector slide 156, that is released by its latch 153, will be moved to the left (FIG. 1) by a spring 267 individual to it. The springs 207 for all of the slides 156 are attached to a cross bar 2416 that is in turn attached to arms 189 of a punch actuator bail 186 pivoted for oscillation on a shaft 199. Extendingbetween the arms 189 (only one shown) is a cross bar 188 carrying a bracket .185 to which the springs 184 are attached. The cross bar 138 of bail 136 serves to rock punch selector slides 156, that are released by their latches 153, clockwise about the shaft 191) on which the slides are slidably and rotatably mounted. The slides 156 each have a shoulder 210 which engages with the cross bar 138 when a slide is released by its latch 153 and moved to the left by its spring 207 whereby when the cross bar 183 is moved clockwise the ends of the punch selector slides 156 that have been released will drive their associated punches 34 through the tape 10.

Oscillation of the shaft 193 will rock the bell crank lever 192 and as a consequence the bell crank lever 194, which is pivotally attached to the cross bar 188, will oscillate the bar 138. The bell crank levers 194 have a restoring bail 215 pivotally mounted on them for moving restoring bail 215 to the right to engage a lip 216 on the bail 215 with shoulders 217 on the punch selector slides to return them after a punching operation has been effected.

Suitably fixed to one of the bell crank levers 192 is a detector actuator bail 12 which has a post 13 fixed to it adjacent its free end for cooperation with a sensing pin 14. The sensing pin 14 is mounted for oscillatory and re ciprocatory movement on a post 15 that is mounted on a bracket 16. The bracket 16 is mounted on the frame of the reperforator by machine screws 17 and comprises a main base portion 18, a pin supporting portion 19 and a mounting portion 20 by means of which the screws 17 hold the detector mechanism 11 on the reperforator framework.

A projection 27 of the pin supporting portion 19 has an abutment pin 28 mounted on it which is aligned with a. guide pin 29 on the portion 2 9. The side of the main body of the sensing pin 14 is urged to bear against the guide pin 29 by a contractile spring 33 that also urges the pin 14 upwardly. The sensing pin 14 has a slot 31 formed in its lower end into which the post 15 extends, thepin 14 being held on the post 15 by a retainer member 32. A contractile spring 33 attached to the bracket 16 and to the sensing pin 14 urges the pin upwardly and clockwise (FIGS. 1 and 3) about the post 15 to carry the spring to the position shown in FIGS. 1 and 2 to bias it against the guide pin 29.

The post 13 on the actuator bail 12 is, as shown in FIG. 1, spaced from a shoulder 35 on the sensing pin 14 but, upon counterclockwise oscillation of the shaft 193 will engage the shoulder 35 and move the sensing pin 14 to the position shown in FIG. 3 against the action of spring 33. The upper end of the sensing pin 14 has a tip 41 formed on it for engagement in feed holes in the tape It) and is guided in its movements by the .walls of a slot 42 in a block 43 fixed on the spacer block 170. When the sensing pin 14 is released by the post 13 on actuator bail 12, the pin will be moved upwardly to engage in a feed hole in the tape by the action of the spring 33 which tends to hold the right edge (FIG. 1) of the pin 14 against guide pin 29 and thereby guide the pin 14 in a rectilinear path.

Fixed to the sensing pin 14 is a driving stud 44 of semicircular cross section, the bottom side being flat and the upper surfaces being rounded. This stud 44 is so located on the sensing pin 14, that if the pin 14 moves in its rectilinear path, the flat bottom of the stud 44 will strike the upper surface of a lever actuating arm 45. The lever actuating arm 45 has a tapered configuration at its upper end as shown at 46 whereby when the sensing pin 14 moves downwardly and the stud 44 strikes the upper surface of the end of the arm, the arm will be driven downwardly but when the stud 44 is moved upwardly it will simply rock the arm counterclockwise from the position shown in FIG. 2 and as soon as the stud 44 passes the end 46, spring 53 will restore the arm 45 to a vertical position.

' The lever actuating arm 45 has a laterally disposed tab 47 formed on it which normally bears against a shoulder 48 on a shoulder stud 49 that extends through a slot 511 (FIG. 3) formed in the tab 47. The arm 45 is restricted in its counterclockwise movement (FIGS. 2 and 4) by a retainer member 51 fixed on the stud 49 and is urged to rock clockwise and to move upwardly about a pivot stud 52 by a spring 53 attached to the block 43. The pivot stud 52 is fixed to the main base portion 18 of the bracket 16 and extends into a slot 55 in arm 45 to support the arm 45 for oscillation and reciprocation. The lever actuating arm 45 has a rounded projection 61) which, as shown in FIG. 2, normally engages a bent over extension 61 on a switch lever 62 that is urged to rotate about a pivot pin 63 in a clockwise direction (FIGS. 2 and 4) by a spring 64. A lower extension 65 of the lever 62 normally holds a switch button 66 of a switch 67 depressed. The switch 67 serves a control for any suitable alarm circuitry (not shown) and upon release of the button 66 will generate an alarm.

A pair of tape guides 68 and 69 are mounted on the top of the block 43 and serve to hold tape 11), which has been perforated by the punch mechanism 26, in association with the sensing pin 14 when the tip 41 thereof enters a perforation in the tape 10.

In the normal operation of the apparatus, signals, received in the reperforator trip the latches 153- and thereby selectively release the punch selector slides 156, to permit the selected ones of them to slide over to the left under the influence of their springs 207. This will move the left ends (FIG. 1) of the selector slides 156 under the punches 34 to be actuated. In moving to the selected position, the selector slides 156 will carry their shoulders 210 over the cross bar 188. After the selector slides 156 have thus been selectively positioned, the oscillatable shaft 193 will, in the normal operation of the apparatus, rock counterclockwise (FIG. 1) to cause the cross bar 188 to move upwardly due ot the interaction of the bell crank levers 192 and 194 forming part of the toggle mechanism 191. The counterclockwiseoscillation of the shaft 193 will draw the feed pawl 496 downwardly to engage it with a new set of teeth on the ratchet 494. When the oscillatable shaft 193 is rocked clockwise, (FIG. 1) it will restore the punch se ector slides 156 to their latch up condition due to the action of the lip 216 of restoring bail 215 on the shoulders 217 of those selector slides 156 that had been released by their latches 153. This operation will also cause the feed pawl 496 to drive the ratchet 494 counterclockwise carrying with it the tape feed roller 491 thereby to advance the tape 10 to the left (FIG. 1).

As the shaft 193 rocks counterclockwise, the post 13 on it engages with the shoulder 35 on the sensing pin 14 to move the sensing pin 14 downwardly from the position shown in FIGS. 1 and 2 to the position shown in FIG. 3. Since the spring 33 tends to draw the sensing pin 14 upwardly and slightly to the right as viewed in FIGS. 1 and 3, the sensing pin 14 in being drawn downwardly by the post 13 will tend to rock clockwise about post 15 as soon as its tip 41 is released from the tape. In addition, the left edge (FIGS. 1 and 3) of the pin 14 will serve as a cam riding on pin 28 to positively move the sensing pin 14 toa vertical position. When the shaft 193 oscillates in a clockwise direction it will release the sensing pin 14 and permit it to move straight up to engage the tip 41 of the sensing pin 14 in a feed hole formed in the tape. This release of the sensing pin 14 by the post 13 will occur before there has been an appreciable amount of movement imparted to the feed pawl 496. Consequently, the tip 41 of the sensing pin 14 will enter a feed hole perforated in the tape and will be rocked by the tape as the tape advances, moving from the position shown in dotted lines in FIG. 1 to the position shown in the solid lines. When the shaft 193 approaches the end of its counterclockwise rotation post 13- will again engage the shoulder 35 to withdraw the tip 41 of the sensing pin 14 from the tape. This action is illustrated in FIG. 5 wherein the path of movement of the driving stud 44 fixed to the sensing pin 14 is shown by the arrows.

In all of the foregoing description of operation it has been assumed that the tape has been-properly fed and that the tape rocked the sensing pin 14 to the left (FIG. 1) to carry the driving stud 44 to the left and that the sensing pin 14 hasmoved downwardly far enough for the driving stud 44 to be below the tapered upper end 46 of the lever actuating arm 45 at the time the pin 14 is released by the tape 10. The driving stud 44 will thus describe the path as illustrated by the line with the arrows on it in FIG. 5.

If for any reason the pawl 496 in cooperation with the ratchet 494 and tape feed roller 491 fails to feed tape, the sensing pin 14 will not be rocked about its post but will be moved downwardly in a rectilinear path rather than following the path indicated by the line with the arrows on it in FIG. 5. When this occurs the driving stud 14 will engage its fiat lower surface with the top of the tapered upper end 46 of the lever actuating arm 45 to drive the arm 45 downwardly against the action *of its spring 53. When this occurs the arm 45 will move downwardly far enough to release the switch lever 62 by disengaging the left-hand edge of the rounded projection 60 from the extension 61 of switch lever 62. This will permit the switch lever to'rock from the position shown in FIG. 2 to the position shown in FIG. 4 where the extension 61 of lever 62 has cleared the top of the projection 60. Thus the lever actuating arm 45 will be latched in the position shown in FIG. 4 until released by manual operation of the switch lever 62. The reperforator may continue to operate but since the switch lever 62 has rocked to the position shown in FIG. 4 the switch 67 will cause an alarm to be sounded and the alarm condition will continue to be maintained until the apparatus is manually reset. Since the tapered upper end 46 of the lever actuating arm 45 is normally in the path of movement of the drivingstud 44 the driving stud 44 will rock the reader actuating arm 45 counterclockwise about the post 54, each time the sensing pin 14 moves upwardly but when this occurs the rounded end of the projection 60 will simply rock in a limited path and will not release extension 61 of switch lever 62 on the upward movement of the pin 14. Thus, if the tape is properly fed the stud 44 on pin 14 will rock the lever actuating arm 45 in each cycle of operation but will not move it downwardly unless there is a tape feed failure. After a tape feed failure the manual rocking of the switch lever 62 counterclockwise (FIGS. 2 and 4) will recondition the apparatus for operation by actuating the switch 67 and releasing the switch actuating arm 45 to permit its spring 53 to move it up to the position shown in FIG. 2.

Although only one embodiment of the invention is shown in the drawings and described in the foregoing specification it will be understood that invention is not limited to the specific embodiment described but is capable of modification and rearrangement and substitution of parts and elements without departing from the spirit of the invention.

What is claimed is:

1. In a device for feeding a web it, an oscillatable shaft,

feed wheel actuating means driven by said shaft;

a feed wheel driven step-by-step by said actuating having feed holes in means for advancing said web one step each time 6 pin actuating means driven by said shaft for imparting movement to said pin away from said web; means on said pin for entering a hole in said web and for consequent movement by said web to oscillate said pin when the web is advanced; alarm means for operation in any cycle of the device when tape is not advanced; and means on said pin for engaging and operating said alarm means in any cycle of the device that said pin is not oscillated.

2. The device according to claim 1 wherein the means for operating the alarm means is a driving stud on the sensing pin which normally moves in a substantially triangular path to avoid engaging the alarm device when proper tape feeding occurs and which moves in a rectilinear path when feeding does not occur.

3. The device according to claim 2 wherein the alarm means includes a lever actuating arm having a portion extending into a path of movement of the driving stud for camming engagement with said stud when the sensing pin moves toward the tape and for operating engagement by the stud when the pin is moved away from the web but is not oscillated.

4. The device according to claim 2 wherein the alarm means includes a switch lever actuating arm mounted for oscillation and reciprocation by said stud, and a switch lever held unoperated by said am! during oscillation of the arm and released for operation upon reciprocation of said arm.

5. The device according to claim 4 wherein the lever actuating arm has a rounded projection which slides on an extension of the switch lever when the arm is oscillated1 and which releases the lever when the arm is' reciprocate 6. The device according to claim 4 wherein the lever actuating arm has a rounded projection which slides on an extension. of the switch lever when the arm is oscillated, which releases the lever when the arm is reciprocated, and which latches said switch lever operated after releasing it to its operated position.

7. In a Web feeding device,

an oscillatable shaft;

feed Wheel actuating means driven by said shaft;

a feed wheel driven step-by-step by said actuating means for engaging perforations in said web to ad- Vance it one step each time said shaft oscillates;

a tape sensing pin mounted for reciprocatory and oscillatory movement;

means for urging said pin toward said web;

pin actuating means driven by said shaft for imparting movement to said pin away from said web;

means on an end of said pin for engagement in a perforation and for movement by said web to oscillate said pin when said web is advanced; and

alarm means operated by said pin when said pin is not moved by the web and is moved away from the web.

8. In a web feeding device having tape feeding means for etfectingstep-by-step advancement of a tape in which tape feed holes have been formed, a tape feed failure detector comprising,

a sensing pin;

means for supporting said pin for reciprocation in a substantially rectilinear path and for oscillation relative to said path;

means for urging said pin toward the tape in said rectilinear path to enter a portion of it in a feed hole in the tape;

means actuated by the tape feeding means, after it effects each step of movement of the tape, for retracting the pin from the tape;

a driving stud fixed to said pin for movement in the rectilinear path with the pin by said urging means and said retracting means when the tape is not advanced and for oscillation with the pin when the tape-is advanced; and

alarm means actuated by said driving stud when the pin is retracted in said rectilinear path and is not oscillated by the tape with the pin.

9. In a web feeding device having tape feeding means for effecting step-by-step advancement of a tape in which tape feed holes have been formed, a tape feed failure detector comprising,

a sensing pin;

means for supporting said pin for reciprocation in a substantially rectilinear path and for oscillation relative to said path;

means for urging said pin toward the tape in said rectilinear path to enter a portion of it in a feed hole in the tape;

means actuated by the tape feeding means, after it effects each step of movement of the tape, for retracting the pin from the tape;

7 a driving stud having a rounded surface and a flat surface and fixed to said pin for movement in the rectilinear path with the pin by said urging means and said retracting means when the tape is not advanced and for oscillation with the pin when the tape is advanced; and

alarm means actuated by said driving stud when the pin is retracted in said rectilinear path and is not oscillated by the tape with the pin, comprising a lever actuating arm, having a tapered end with a surface for engagement by the fiat surface of the driving stud to move the alarm rectilinearly and generate an alarm, and a camming surface for engagement by the rounded surface on the stud to oscillate the arm.

10. In a web feeding device having tape feeding means for effecting step-by-step advancement of a tape in which tape feed holes have been formed, a tape feed failure detector comprising,

a sensing pin;

means for supporting said pin for reciprocation in a substantially rectilinear path and for oscillation relative to said path;

means for urging said pin toward the tape in said rectilinear path to enter a portion of it in a feed hole in the tape;

means actuated by the tape feeding means, after it effects each step of movement of the tape, for retracting the pin from the tape;

a driving stud fixed to said pin for movement in the rectilinear path with the pin by said urging means and said retracting means when the tape is not advanced and for oscillation with the pin when the tape is advanced;

a lever actuating arm actuated by said driving stud when the pin is retracted in said rectilinear path and is not oscillated by the tape with the pin, said arm having a tapered portion formed of a stud engaging surface and a camming surface whereby said stud oscillates the arm when the sensing pin moves toward the tape and moves the arm in a substantially rectilinear path when the sensing pin is retracted in the rectilinear path; and

a switch lever released and operated by said arm when the arm is moved rectilinearly.

11. In a web feeding device having tape feeding means for effecting step-by-step advancement of a web in which feed holes have been formed, a web feed failure detector comprising,

a sensing means for engagement with and oscillation by the web on each step of movement of the web;

means on said sensing means for entering a feed hole in the Web to form a driving connection between the sensing means and the Web;

means for supporting the sensing means for reciprocation and for oscillation;

8 an alarm actuating member for actuation by said sensing means;

means for urging said sensing means to reciprocate in a rectilinear path; and means on and which reciprocates and oscillates with said sensing means for engaging and actuating said alarm actuating member each time the sensing means is reciprocated without being oscillated by the web. 12. In a tape feeding device having tape feeding means for effecting step-by-step advancement of a tape in which tape feed holes have been formed, a tape feed failure detector comprising,

a sensing means for engagement with and oscillation by the tape on each step of movement of the tape;

means on said sensing means for entering a feed hole in the tape to form a driving connection between the sensing means and the tape;

means for supporting the sensing means for reciprocation and for oscillation;

an alarm actuating member mounted for oscillatory and rectilinear actuation by said sensing means;

means for urging said sensing means to reciprocate in a rectilinear path;

means on said sensing means for engaging and actuating said alarm actuating member rectilinearly each time the sensing means is reciprocated without being oscillated by the tape and for oscillating said memberon each operation of the feeding means;

a switch operating lever held unoperated by said alarm actuating member during oscillation of said member and released for operation upon rectilinear movement of the member; and

an alarm switch for operation by said lever.

13. In a web feeding device having web feeding means for effecting step-by-step advancement of a web in which feed holes have been formed, a feed failure detector comprising a sensing means for engagement with and oscillation by the web on each step of movement of the web;

means on said sensing means for entering a feed hole in the web to form a driving connection between the sensing means and the web;

means for supporting the sensing means for reciprocation and for oscillation;

means for urging said sensing means toward the Web to effect said driving connection;

means actuated by the web feeding means for retracting the sensing means away from the tape;

an alarm actuating member for actuation by said sensing means; and

means on and which re'ciprocates and oscillates with said sensing means to engage and operate said alarm actuating member upon retraction of said sensing means when the web fails to advance and oscillate the sensing means.

14. In a tape feeding device having tape feeding means for effecting step-by-step advancement of a tape in which tape feed holes have been formed, a tape feed failure detector comprising,

a sensing means for engagement with and oscillation by the tape on each step of movement of the tape;

means on said sensing means for entering a feed hole in the tape to form a driving connection between the sensing means and the tape;

means for supporting the sensing means for reciprocation and for oscillation;

means for urging said sensing means toward the tape- 9 10 upon retraction of said sensing means when the tape References Cited by the Examiner does not advance and oscillate the sensing means; UNITED STATES PATENTS an alarm lever actuated b said rm in movin to said position; and y a g 3,044,675 7/1962 Turner 226-11 cooperating surfaces on said arm and lever for latching 5 3,148,605 9/1964 Peterson 22633 X the lever in actuated position and for latching the arm out of the path of said means on the sensing HENSON WOOD Prmary Exammer' means. I. N. 'ERLICH, Assistant Examiner. 

1. IN A DEVICE FOR FEEDING A WEB HAVING FEED HOLES IN IT, AN OSCILLATABLE SHAFT, FEED WHEEL ACTUATING MEANS DRIVEN BY SAID SHAFT; A FEED WHEEL DRIVEN STEP-BY-STEP BY SAID ACTUATING MEANS FOR ADVANCING SAID WEB ONE STEP EACH TIME SAID SHAFT OSCILLATES; A TAPE SENSING PIN MOUNTED FOR RECIPROCATORY AND OSCILLATORY MOVEMENT; MEANS FOR URGING SAID PIN TOWARD SAID WEB; PIN ACTUATING MEANS DRIVEN BY SAID SHAFT FOR IMPARTING MOVEMENT TO SAID PIN AWAY FROM SAID WEB; MEANS ON SAID PIN FOR ENTERING A HOLE IN SAID WEB AND FOR CONSEQUENT MOVEMENT BY SAID WEB TO OSCILLATE SAID PIN WHEN THE WEB IS ADVANCED; ALARM MEANS FOR OPERATION IN ANY CYCLE OF THE DEVICE WHEN TAPE IS NOT ADVANCED; AND MEANS ON SAID PIN FOR ENGAGING AND OPERATING SAID ALARM MEANS IN ANY CYCLE OF THE DEVICE THAT SAID PIN IS NOT OSCILLATED. 